Etymology
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renewable (adj.)

"capable of being renewed," 1727, of a lease, etc., from renew (v.) + -able. In reference to energy sources, "not depletable by utilization," attested by 1971. Related: Renewability.

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Definitions of renewable

renewable (adj.)
that can be renewed or extended;
renewable subscriptions
a renewable lease
renewable (adj.)
capable of being renewed; replaceable;
renewable energy such as solar energy is theoretically inexhaustible
From wordnet.princeton.edu